The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2007
Filed:
Aug. 30, 2005
Seiji Suga, Kanagawa, JP;
Tomoya Tsukada, Kanagawa, JP;
Seiji Suga, Kanagawa, JP;
Tomoya Tsukada, Kanagawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A variable valve timing control apparatus employs a five-blade vane member fixedly connected to a camshaft end and rotatably disposed in a phase-converter housing formed integral with a sprocket driven by an engine crankshaft. Five phase-retard chambers and five phase-advance chambers are defined by five blades of the vane member and the housing, for creating a phase change of the vane member relative to the housing. A circumferential width of each of a first pair of blades, located on both sides of a first blade having a maximum circumferential width, is dimensioned to be less than a circumferential width of each of a second pair of blades, circumferentially spaced apart from the first blade rather than the first pair. The circumferential width of each of the second pair of blades is dimensioned to be less than the maximum circumferential width of the first blade.